php資料最佳化

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Array(    [0] => Array        (            [id] => 19            [receive_id] => 41            [mac] => a4:3d:78:fc:49:50            [staytime] => 400        )    [1] => Array        (            [id] => 20            [receive_id] => 42            [mac] => a4:3d:78:fc:49:51            [staytime] => 200        )    [2] => Array        (            [id] => 22            [receive_id] => 42            [mac] => a4:3d:78:fc:49:50            [staytime] => 2443        )    [3] => Array        (            [id] => 23            [receive_id] => 42            [mac] => a4:3d:78:fc:49:50            [staytime] => 1443        )    [4] => Array        (            [id] => 24            [receive_id] => 42            [mac] => a4:3d:78:fc:49:51            [staytime] => 1143        )    [5] => Array        (            [id] => 25            [receive_id] => 42            [mac] => a4:3d:78:fc:49:51            [staytime] => 543        ))
舉例將以上數組按mac區分成

Array(    [a4:3d:78:fc:49:50] => Array        (            [id] => 19            [receive_id] => 41            [mac] => a4:3d:78:fc:49:50            [staytime] => 400            [timmarr] => Array                (                    [0] => Array                        (                            [id] => 19                            [receive_id] => 41                            [mac] => a4:3d:78:fc:49:50                            [staytime] => 400                        )                    [1] => Array                        (                            [id] => 22                            [receive_id] => 42                            [mac] => a4:3d:78:fc:49:50                            [staytime] => 2443                        )                    [2] => Array                        (                            [id] => 23                            [receive_id] => 42                            [mac] => a4:3d:78:fc:49:50                            [staytime] => 1443                        )                )        )    [a4:3d:78:fc:49:51] => Array        (            [id] => 20            [receive_id] => 42            [mac] => a4:3d:78:fc:49:51            [staytime] => 200            [timmarr] => Array                (                    [0] => Array                        (                            [id] => 20                            [receive_id] => 42                            [mac] => a4:3d:78:fc:49:51                            [staytime] => 200                        )                    [1] => Array                        (                            [id] => 24                            [receive_id] => 42                            [mac] => a4:3d:78:fc:49:51                            [staytime] => 1143                        )                    [2] => Array                        (                            [id] => 25                            [receive_id] => 42                            [mac] => a4:3d:78:fc:49:51                            [staytime] => 543                        )                )        ))
----------------------
php代碼：

$macArr =   [];
$macUserArr =    [];

for($i=0;$i<$countList;$i++){
    if(!in_array($list[$i][‘mac‘],$macArr)){
        $macArr[]   =   $list[$i][‘mac‘];
        $macUserArr[$list[$i][‘mac‘]] =   $list[$i];
        $macUserArr[$list[$i][‘mac‘]][‘timmarr‘][]  = $list[$i];
    }else{
        $macUserArr[$list[$i][‘mac‘]][‘timmarr‘][]  =   $list[$i];
    }
}
少迴圈次數

php資料最佳化